Dear Greg, Riccardo, et al.

> Riccardo wrote:
> I don't know exactly about the other problems, but this one 
> should be related to the version of the installed PIL. If I 
> remember correctly, BGRA raw mode requires PIL 1.1.7.

@Riccardo - 
Thanks for the advice, Riccardo.  I think I was already on 1.1.7 - but
maybe an alpha release(?)  Anyway, I have now standardised across Python
2.6 and 2.7 with the latest PIL installers from
http://www.pythonware.com/products/pil/.


> Greg wrote: 
> I will try to do an aggdraw build for 2.7. If I succeed, I'll 
> post something.

@Greg -
Thanks for the kind offer.  I for one would be very pleased to be using
aggdraw again (as I think the image quality seems the best).  I am
pleased to say, however, that it is less critical now that I have worked
through my cairo issues!  : )


Previously I was getting:

Python 2.7.1 (r271:86832, Nov 27 2010, 18:30:46) [MSC v.1500 32 bit
(Intel)] on win32
Type "copyright", "credits" or "license()" for more information.
>>> from rdkit import Chem
>>> from rdkit.Chem import AllChem, Draw
>>> mol = Chem.MolFromSmiles("c1ccccc1")
>>> AllChem.Compute2DCoords(mol)
>>> im = Draw.MolToImage(mol)
!!!PYTHONW.EXE CRASH!!!


Finally, after a morning of going round in circles (and following
red-herring Dependency Walker trails(!)), things are running well; with
RDKit now happily calling cairo!  I thought it might be useful for
others to list the versions of software / DLLs that I finally found to
work:

Windows XP Pro. SP3 (32-bit)
Python 2.7.1 (http://www.python.org/ftp/python/2.7.1/python-2.7.1.msi)
PIL 1.1.7 (installer -
http://effbot.org/downloads/PIL-1.1.7.win32-py2.7.exe)
Pycairo-1.8.10.win32-py2.7 (installer -
http://ftp.gnome.org/pub/GNOME/binaries/win32/pycairo/1.8/pycairo-1.8.10
.win32-py2.7.exe)
Libcairo-2.dll (get from the following archive:
http://wxpython.org/cairo/cairo_1.8.6-1_win32.zip)
libpng12-0.dll (get from the following archive:
http://wxpython.org/cairo/libpng_1.2.34-1_win32.zip)
Zlib1.dll (get from the following archive:
http://wxpython.org/cairo/zlib123-dll.zip)

I then put the 3 DLLs into the C:\Python27\Lib\site-packages\cairo\
folder, and made sure that this is on the system path.  The use of the
wxPython DLLs seemed to be the key to sorting things out (I certainly
tried a few other versions!) - thanks to Alex Matan's blog-post for the
instructions
(http://electromagnetictelegraph.com/install-cairo-wxpyton-pycairo-pytho
n-windows)

The setup under 2.6 was exactly the same - except I used the
corresponding 2.6 installer for PIL, and used the
Pycairo-1.8.4.win32-py26 from the wxPython site
(http://wxpython.org/cairo/pycairo-1.8.4.win32-py2.6.exe) as detailed in
Alex's blog.


I can add these instructions to to the wiki if you like(?)

Kind regards

James

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